Iron Blue Dun Wet Fly is a traditional river wet imitation, tied to represent the small, dark upwinged olives that hatch on cooler, overcast days across many rivers. It’s a pattern that doesn’t shout for attention, but when fish switch onto iron blues or similar dark insects, it can be the difference between refusals and steady takes.
Slim, understated and easy to fish, this fly sits nicely just below the surface where trout and grayling often intercept emerging duns. There’s no heavy flash or exaggerated movement, just a natural outline that works when fish are feeding confidently but selectively. Whether you’re covering a steady glide or fishing as part of a classic team of wets, the Iron Blue Dun remains a dependable choice throughout the season.
Please note all of our fishing flies are barbless unless otherwise stated.
Iron Blue Dun Wet Fly Specification
Target Species - Trout / Grayling
Tag - Floss Red
Tail - Cock Iron Blue Dun
Body - Mole Skin
Hackle - Cock Iron Blue Dun
Wing - Half Mallard
Head - Black Silk
Hook - Barbless, Mustad of Norway
How To Fish the Iron Blue Dun Wet Fly
Across & Down Swing
Cast slightly across and downstream and allow the current to bring the line tight. The fly swings just under the film, imitating an emerging dun being carried across the flow.
Dead Drift
A very effective approach during natural hatches. Fish it upstream with as little drag as possible and let it travel naturally through likely holding water.
Top Dropper Method
An excellent option on the top dropper of a traditional wet fly cast. Lift gently into the hang or use a slow retrieve to bring the fly toward the surface film, suggesting a struggling iron blue and often provoking confident takes.
